Method and apparatus for received signal quality estimation
a technology of received signal and quality estimation, applied in the field of communication signal processing, can solve the problems of computational complexity in the determination of actual received signal quality and complicated power control
Inactive Publication Date: 2005-09-15
TELEFON AB LM ERICSSON (PUBL)
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AI Technical Summary
Benefits of technology
The present invention is a method and apparatus for estimating signal quality in a received signal by measuring and accounting for inter-symbol interference based on the performance of the receiver. This helps to obtain accurate signal quality measurements without complex calculations and can be used to adjust transmit power and quality indicators. The invention provides a simple scaling metric to account for un-canelled inter-symbol interference in the received signal. The method and apparatus can be implemented in hardware or software and can be used in various wireless communication devices.
Problems solved by technology
While the above link power control is straightforward in description, in practice such power control can be complicated by the requirement to timely and accurately determine the received signal quality at the inner-loop power control rate.
Because signal quality in such environments depends on the characteristics of multipath signal reception from one or more network transmitters, determination of actual received signal quality can be computationally complex.
Method used
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Embodiment Construction
[0016]FIG. 1 is a diagram of an exemplary wireless communication network 10 and an exemplary wireless communication device 12. Network 10 communicatively couples device 12 to one or more external networks 14 (e.g., PSTN, Internet, etc.), and to other devices in the same or other wireless networks. Network 10 comprises a Radio Access Network (RAN) 16, which at least includes a Radio Network Controller (RNC) 18, and one or more Radio Base Stations (RBSs) 20, which also are referred to as “Node B” transceivers. RAN 16 provides the network-to-radio interface between device 12 and one or more Core Networks (CNs) 22, which communicatively link to the external networks 14. Here, as elsewhere in this document, use of the terms “comprising” and “comprises” specifies the presence of stated features, integers, steps, or components but does not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof.
[0017] By way of non-limiting example, ...
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A processing circuit and method generate signal quality estimates based on scaling measured inter-symbol interference (ISI) in a received signal according to a cancellation metric corresponding to ISI cancellation performance of the receiver. By accounting for ISI cancellation performance of the receiver based on a simple scaling metric, accurate received signal quality measurements are obtained in a manner that accounts for un-cancelled ISI in the received signal without requiring use of potentially complex multipath combining weight calculations in the signal quality calculation. Signal quality estimation results may be used for sending corresponding Channel Quality Indicators, communication link transmit power control commands, etc. In some embodiments, the cancellation metric is maintained as a dynamic value based on measured ISI cancellation performance, while in other embodiments the cancellation metric comprises a pre-configured value stored in memory, for example.
Description
BACKGROUND OF THE INVENTION [0001] The present invention generally relates to communication signal processing and particularly relates to measuring received signal quality. [0002] Many types of communication systems employ some form of transmit power control, wherein the transmit power of a transmitter is controlled explicitly or implicitly in response to feedback from a remote receiver. For example, interference limited systems, such as Code Division Multiple Access (CDMA) wireless communication networks, use forward and reverse link power control to control interference and promote efficient use of available transmit power resources. [0003] With respect to a given mobile terminal, forward link power control comprises receiving power control commands from the mobile terminal at a supporting network base station and adjusting the forward link transmit power allocated for serving that mobile terminal up and down according to the incoming commands. If the received forward link signal ...
Claims
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IPC IPC(8): H04L1/00H04L1/20H04L5/12H04L25/03
CPCH04B2201/709727H04L25/03006H04L1/20H04L1/0026
Inventor JONSSON, ELIAS
Owner TELEFON AB LM ERICSSON (PUBL)